Waaaaaaaait a minute.
So you mean to tell me that it's possible to get skills from other classes that a character wouldn't normally have access to via My Castle?
For example, if I had two DS'es, and two copies of FE:If... I could recruit any male character, marry them to Mozume, Marriage Seal to Villager, get Aptitude, and then put them in Streetpass so I, and others, could profit without actually HAVING to marry Mozume on the file in which you want Aptitude on? Do the skills get stored once acquired, or do they poof when you remove them from their active Skillset?